Bowo lokhalo lili ndi mphamvu ya parasitic pansi.Ngati m'mimba mwake wa dzenje lodzipatula lomwe lili pansi pa dzenjelo limadziwika kuti ndi D2, kutalika kwa bowo ndi D1, makulidwe a bolodi la PCB ndi T, ndi dielectric mosalekeza wa gawo lapansi. ndi ε, The parasitic capacitance of the via is about C=1.41 ε TD1/(D2-D1)
Chotsatira chachikulu cha parasitic capacitance pa dera lomwe limayambitsidwa ndi vias ndikuti limatalikitsa nthawi yazizindikiro ndikuchepetsa liwiro la dera.Mwachitsanzo, pa bolodi la PCB lokhala ndi makulidwe a Mil 50, ngati ma vias okhala ndi mainchesi amkati a Mil 10 ndi mapadi awiri a Mil 20 amagwiritsidwa ntchito, ndipo mtunda wapakati pa pedi ndi mkuwa pansi ndi 32 Mil. , titha kuwerengera kuchuluka kwa parasitic capacitance ya vias pogwiritsa ntchito chilinganizo pamwambapa motere: C=1.41 x 4.4x 0.050 x 0.020/(0.032-0.020)=0.517pF, Kusintha kwa nthawi yoyambira chifukwa cha kuthekera uku ndi: T10-90 =2.2C (Z0/2)=2.2x0.517x (55/2)=31.28ps.Kuchokera pazikhalidwezi, zikhoza kuwonedwa kuti ngakhale kuti mphamvu ya parasitic ya njira imodzi yodutsa ikhoza kukhala ndi zotsatira zochepetsera kuchepetsa kukwera, kusamala kuyenera kuchitidwa ngati vias amagwiritsidwa ntchito kangapo mu waya wa interlayer kusintha.
Pamodzi ndi parasitic capacitance mu via, palinso parasitic inductance.The parasitic series inductance imafooketsa chopereka cha bypass capacitance ndikufooketsa kusefa kwadongosolo lonse lamphamvu.Njira yotsatirayi ingagwiritsidwe ntchito kungowerengera pafupifupi parasitic inductance kudzera:
L=5.08h [ln (4h/d)+1], pamene L akunena za kulowetsa kwa dzenje, h ndi kutalika kwa dzenje, ndipo d ndi m'mimba mwake wa dzenje lapakati.Kuchokera pa equation, zitha kuwoneka kuti mainchesi a via amakhudza pang'ono pa inductance, pomwe kutalika kwa via kumakhudza kwambiri inductance.Pogwiritsa ntchito chitsanzo chapamwambachi, inductance ya via imatha kuwerengedwa ngati L=5.08x0.050 [ln (4x0.050/0.010)+1]=1.015nH.Ngati nthawi yokweza chizindikiro ndi 1ns, ndiye kuti kukula kwake kofananako ndi: XL=π L/T10-90=3.19 Ω.
Powombetsa mkota:
Kusankha PCB yocheperako ndikopindulitsa pakuchepetsa magawo a parasitic
Yesetsani kuti musasinthe zigawo kapena kugwiritsa ntchito ma vias osafunika pamayendedwe azizindikiro
Boolani mabowo pafupi ndi magetsi ndi nthaka, ndipo mawaya afupikitsa ndi okhuthala a mabowo ndi mapini, ndi bwino.
Ikani mabowo ambiri pafupi ndi chizindikiro chosinthira chizindikiro kuti mupereke dera lapafupi kwambiri la chizindikiro
Mukamapanga zinthu zingapo za fiber fiber, monga Optical module,ONU, gawo la kuwala kwa fiber, gawo la OLT, ndi zina zotero, muyenera kulingalira za momwe vias pa bosa, chithunzithunzi cha diso, chiŵerengero cha kuzimiririka, ndi zina zotero, kapena zotsatira za kulandira kukhudzika.
Zomwe zili pamwambazi ndizofotokozera mwachidule za "Introduction to Key Parameters of BOSA - kudzera kukula (II)", zomwe zingagwiritsidwe ntchito ngati zofotokozera.Kampani yathu ili ndi gulu lolimba kwambiri laukadaulo ndipo imatha kupereka chithandizo chaukadaulo kwa makasitomala.Pakadali pano, kampani yathu ili ndi mitundu yosiyanasiyana: yanzeruinu, gawo lolumikizana la kuwala, gawo la optical fiber, sfp optical module, zida za olt, switch ya Efaneti ndi zida zina zamtaneti.Ngati mukufuna, mutha kuphunzira zambiri za iwo.
